https://bugs.winehq.org/show_bug.cgi?id=56114
--- Comment #3 from Cedric cedric.dewijs@eclipso.eu --- (In reply to Alexandre Julliard from comment #2)
Please use the forum for support questions.
This is not a support question. I was told wine should not use a directory inside WINEPREFIX as source for an emulated CD drive in bug 56091 (linked) " You can't enter the WINEPREFIX directory from the Unix browser. That's on purpose, to prevent infinite loops and duplicate files. "
If the Unix browser can't enter the WINEPREFIX directory on purpose, it's logical it's also not suppose to accept a location inside the WINEPREFIX when manually typed.
Following that logic, it's a bug in winecfg that it's possible to manually specify a location as source for a CD drive inside the WINEPREFIX
I could be wrong however.